@Bill the Lizard: Ah, I misunderstood it. I thought that SO add the same amount of rep as the user did. But as you pointed out, SO always add 50 rep to the bounty. I updated my question.
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JonasApr 27 '10 at 12:42

1 Answer
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I'm not sure how the data dump schema will be changing (if at all) given the recent changes to the bounty system, but in the meantime, I created a Data Explorer query that shows the number of bounties awarded for each bounty level. You can find the query here.

I'll update it if necessary after the next data dump.

EDIT: Oops! I should have checked more carefully. When the bounty amount is zero, that means a user self-accepted a bounty. When the bounty amount is NULL, that meant the bounty expired. I've updated the query to show these properly now.

Unfortunately, that information is not available in the data dump. I have a post written up about how to fix it, but I'm waiting to see the changes to the database schema first, since that's only a week or so away. Looking at the results of the query, those numbers do stick out somewhat, probably because of auto-acceptance. @Gra
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Jon SeigelJun 25 '10 at 1:04